nixpkgs/nixos/lib/make-disk-image.nix

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{ pkgs
, lib
, # The NixOS configuration to be installed onto the disk image.
config
, # The size of the disk, in megabytes.
diskSize
, # Whether the disk should be partitioned (with a single partition
# containing the root filesystem) or contain the root filesystem
# directly.
partitioned ? true
# Whether to invoke switch-to-configuration boot during image creation
, installBootLoader ? true
, # The root file system type.
fsType ? "ext4"
, # The initial NixOS configuration file to be copied to
# /etc/nixos/configuration.nix.
configFile ? null
, # Shell code executed after the VM has finished.
postVM ? ""
, name ? "nixos-disk-image"
# This prevents errors while checking nix-store validity, see
# https://github.com/NixOS/nix/issues/1134
, fixValidity ? true
, format ? "raw"
}:
with lib;
pkgs.vmTools.runInLinuxVM (
pkgs.runCommand name
{ preVM =
''
mkdir $out
diskImage=$out/nixos.${if format == "qcow2" then "qcow2" else "img"}
${pkgs.vmTools.qemu}/bin/qemu-img create -f ${format} $diskImage "${toString diskSize}M"
mv closure xchg/
'';
buildInputs = [ pkgs.utillinux pkgs.perl pkgs.e2fsprogs pkgs.parted ];
exportReferencesGraph =
[ "closure" config.system.build.toplevel ];
inherit postVM;
memSize = 1024;
}
''
${if partitioned then ''
# Create a single / partition.
parted /dev/vda mklabel msdos
parted /dev/vda -- mkpart primary ext2 1M -1s
. /sys/class/block/vda1/uevent
mknod /dev/vda1 b $MAJOR $MINOR
rootDisk=/dev/vda1
'' else ''
rootDisk=/dev/vda
''}
# Create an empty filesystem and mount it.
mkfs.${fsType} -L nixos $rootDisk
mkdir /mnt
mount $rootDisk /mnt
# Register the paths in the Nix database.
printRegistration=1 perl ${pkgs.pathsFromGraph} /tmp/xchg/closure | \
nixos/lib/make-disk-image: refactor to use nixos-install - Replace hand-rolled version of nixos-install in make-disk-image by an actual call to nixos-install - Required a few cleanups of nixos-install - nixos-install invokes an activation script which the hand-rolled version in make-disk-image did not do. We remove /etc/machine-id as that's a host-specific, impure, output of the activation script Testing: nix-build '<nixpkgs/nixos/release.nix>' -A tests.installer.simple passes Also tried generating an image with: nix-build -E 'let pkgs = import <nixpkgs> {}; lib = pkgs.lib; nixos = import <nixpkgs/nixos> { configuration = { fileSystems."/".device = "/dev/disk/by-label/nixos"; boot.loader.grub.devices = [ "/dev/sda" ]; boot.loader.grub.extraEntries = '"''"' menuentry "Ubuntu" { insmod ext2 search --set=root --label ubuntu configfile /boot/grub/grub.cfg } '"''"'; }; }; in import <nixpkgs/nixos/lib/make-disk-image.nix> { inherit pkgs lib; config = nixos.config; diskSize = 2000; partitioned = false; installBootLoader = false; }' Then installed the image: $ sudo df if=./result/nixos.img of=/dev/sdaX bs=1M $ sudo resize2fs /dev/disk/by-label/nixos $ sudo mount /dev/disk/by-label/nixos /mnt $ sudo mount --rbind /proc /mnt/proc $ sudo mount --rbind /dev /mnt/dev $ sudo chroot /mnt /nix/var/nix/profiles/system/bin/switch-to-configuration boot [ … optionally do something about passwords … ] and successfully rebooted to that image. Was doing all this from inside a Ubuntu VM with a single user nix install.
2016-08-16 03:02:20 +00:00
${config.nix.package.out}/bin/nix-store --load-db --option build-users-group ""
${if fixValidity then ''
# Add missing size/hash fields to the database. FIXME:
# exportReferencesGraph should provide these directly.
${config.nix.package.out}/bin/nix-store --verify --check-contents --option build-users-group ""
'' else ""}
nixos/lib/make-disk-image: refactor to use nixos-install - Replace hand-rolled version of nixos-install in make-disk-image by an actual call to nixos-install - Required a few cleanups of nixos-install - nixos-install invokes an activation script which the hand-rolled version in make-disk-image did not do. We remove /etc/machine-id as that's a host-specific, impure, output of the activation script Testing: nix-build '<nixpkgs/nixos/release.nix>' -A tests.installer.simple passes Also tried generating an image with: nix-build -E 'let pkgs = import <nixpkgs> {}; lib = pkgs.lib; nixos = import <nixpkgs/nixos> { configuration = { fileSystems."/".device = "/dev/disk/by-label/nixos"; boot.loader.grub.devices = [ "/dev/sda" ]; boot.loader.grub.extraEntries = '"''"' menuentry "Ubuntu" { insmod ext2 search --set=root --label ubuntu configfile /boot/grub/grub.cfg } '"''"'; }; }; in import <nixpkgs/nixos/lib/make-disk-image.nix> { inherit pkgs lib; config = nixos.config; diskSize = 2000; partitioned = false; installBootLoader = false; }' Then installed the image: $ sudo df if=./result/nixos.img of=/dev/sdaX bs=1M $ sudo resize2fs /dev/disk/by-label/nixos $ sudo mount /dev/disk/by-label/nixos /mnt $ sudo mount --rbind /proc /mnt/proc $ sudo mount --rbind /dev /mnt/dev $ sudo chroot /mnt /nix/var/nix/profiles/system/bin/switch-to-configuration boot [ … optionally do something about passwords … ] and successfully rebooted to that image. Was doing all this from inside a Ubuntu VM with a single user nix install.
2016-08-16 03:02:20 +00:00
# In case the bootloader tries to write to /dev/sda…
ln -s vda /dev/xvda
ln -s vda /dev/sda
nixos/lib/make-disk-image: refactor to use nixos-install - Replace hand-rolled version of nixos-install in make-disk-image by an actual call to nixos-install - Required a few cleanups of nixos-install - nixos-install invokes an activation script which the hand-rolled version in make-disk-image did not do. We remove /etc/machine-id as that's a host-specific, impure, output of the activation script Testing: nix-build '<nixpkgs/nixos/release.nix>' -A tests.installer.simple passes Also tried generating an image with: nix-build -E 'let pkgs = import <nixpkgs> {}; lib = pkgs.lib; nixos = import <nixpkgs/nixos> { configuration = { fileSystems."/".device = "/dev/disk/by-label/nixos"; boot.loader.grub.devices = [ "/dev/sda" ]; boot.loader.grub.extraEntries = '"''"' menuentry "Ubuntu" { insmod ext2 search --set=root --label ubuntu configfile /boot/grub/grub.cfg } '"''"'; }; }; in import <nixpkgs/nixos/lib/make-disk-image.nix> { inherit pkgs lib; config = nixos.config; diskSize = 2000; partitioned = false; installBootLoader = false; }' Then installed the image: $ sudo df if=./result/nixos.img of=/dev/sdaX bs=1M $ sudo resize2fs /dev/disk/by-label/nixos $ sudo mount /dev/disk/by-label/nixos /mnt $ sudo mount --rbind /proc /mnt/proc $ sudo mount --rbind /dev /mnt/dev $ sudo chroot /mnt /nix/var/nix/profiles/system/bin/switch-to-configuration boot [ … optionally do something about passwords … ] and successfully rebooted to that image. Was doing all this from inside a Ubuntu VM with a single user nix install.
2016-08-16 03:02:20 +00:00
# Install the closure onto the image
USER=root ${config.system.build.nixos-install}/bin/nixos-install \
--closure ${config.system.build.toplevel} \
--no-channel-copy \
--no-root-passwd \
${optionalString (!installBootLoader) "--no-bootloader"}
# Install a configuration.nix.
mkdir -p /mnt/etc/nixos
${optionalString (configFile != null) ''
cp ${configFile} /mnt/etc/nixos/configuration.nix
''}
nixos/lib/make-disk-image: refactor to use nixos-install - Replace hand-rolled version of nixos-install in make-disk-image by an actual call to nixos-install - Required a few cleanups of nixos-install - nixos-install invokes an activation script which the hand-rolled version in make-disk-image did not do. We remove /etc/machine-id as that's a host-specific, impure, output of the activation script Testing: nix-build '<nixpkgs/nixos/release.nix>' -A tests.installer.simple passes Also tried generating an image with: nix-build -E 'let pkgs = import <nixpkgs> {}; lib = pkgs.lib; nixos = import <nixpkgs/nixos> { configuration = { fileSystems."/".device = "/dev/disk/by-label/nixos"; boot.loader.grub.devices = [ "/dev/sda" ]; boot.loader.grub.extraEntries = '"''"' menuentry "Ubuntu" { insmod ext2 search --set=root --label ubuntu configfile /boot/grub/grub.cfg } '"''"'; }; }; in import <nixpkgs/nixos/lib/make-disk-image.nix> { inherit pkgs lib; config = nixos.config; diskSize = 2000; partitioned = false; installBootLoader = false; }' Then installed the image: $ sudo df if=./result/nixos.img of=/dev/sdaX bs=1M $ sudo resize2fs /dev/disk/by-label/nixos $ sudo mount /dev/disk/by-label/nixos /mnt $ sudo mount --rbind /proc /mnt/proc $ sudo mount --rbind /dev /mnt/dev $ sudo chroot /mnt /nix/var/nix/profiles/system/bin/switch-to-configuration boot [ … optionally do something about passwords … ] and successfully rebooted to that image. Was doing all this from inside a Ubuntu VM with a single user nix install.
2016-08-16 03:02:20 +00:00
# Remove /etc/machine-id so that each machine cloning this image will get its own id
rm -f /mnt/etc/machine-id
umount /mnt
# Make sure resize2fs works
${optionalString (fsType == "ext4") ''
tune2fs -c 0 -i 0 $rootDisk
''}
''
)